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20 Cards in this Set
- Front
- Back
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What is hardware and what's the structure of its components? |
Physical components of a computer system |
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What does the arithmetic and control unit do? |
arithmetic unit - carries out arithmetic and logical operations Control unit - uses electrical signals to control the flow of data within the cpu |
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What's the fetch excite cycle? |
Fetch- instructions from memory Decode- instructions to find what processing to do Execute - the instruction |
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What is a boot sequence and boot loader? |
Sequence of proceses that contain all the information and instructions to get computer running Boot loader- programme that starts this sequence when computer is switched on
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What happens after the boot sequence is completed? |
Control is handed to operating system to provide programs for the CPU to process |
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What does the speed of the CPU depend on? |
CPU clock speed Cache memory Number of processor cored |
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What are advantages and disavantages of multiple processor cores? |
Advantages - more data processed simultaneously Disavantages -more complicated operating systems are needed to manage them
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What are properties of ram? |
Volatile- data lost when power turned off Accessed and changed by computer at any time Stores programs and data bring used by the computer Large- 4 Gb or more |
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What are properties of rom? |
Non volatile
Stores instructions and data required to start up the computer Programmed during computermanufactureStores instructions and data required to start up the computerContains the boot programSmall 1/2 Mb for the boot program Contains the boot program Small 1/2 Mb for the boot program
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What Is virtual memory? |
Part of the Hard drive extension to ram Used when computer does not have enough ram to hold programmes/data Slow because data passed between ram and virtual memory |
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What is flash memory? |
Type of rom can be rewritten Portable |
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What gate is this and what's the output? |
Not gate Output- opposite to input |
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What type of gate Is this and what's it's output? |
And gate Output- only 1 if both I'm puts are 1 |
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What gate is this and what's it's output? |
Or gate Output- at least one input has to be 1 for output to be 1 |
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Name 6 input devices? |
1 . keyboard 2 . microphone 3 . touch screen 4. cameras 5. bar codes 6. RFID reader- reads data from an electronic version of bar code |
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Name 4 devices useful for people with disabilitys and what they do? |
1. Eye typer- camera tracks movement of eyes and detects key 2.foot mouse- track ball operated by foot 3. Puff suck switch- blow/ suck on a small tube 4.braille-keys have embossed pattern |
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Name 5 output devices? |
1 . monitor 2. Printer 3. Plotter - large scale drawings 4. Speakers 5. Actuators- create physical movements in response to a computer |
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Advantages of magnetic hard disk? |
Reliable High capacity Low cost |
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Advantages of optical disk? |
Good capacity Low cost Lightweight and portable |
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Advantages and disavantages flash memory ? |
Ad- good capacity/used in hand held devices Dis- more expensive than hard disk |
